change weights to -100.0...+100.0 per cent

The upper and lower horizontal trapeze line will change.
The vertical weight is not implemented now!

1 files changed, 19 insertions, 13 deletions

diff --git a/color_pipe.c b/color_pipe.c
index 648e259..b0a9ddf 100644
--- a/color_pipe.c
+++ b/color_pipe.c
@@ -396,8 +396,8 @@ static void set_default_value(struct color_pipe_t *pipe) {
 	
 	pipe->trapcorr_data.enable = 0;
 	pipe->trapcorr_data.map_init = 0;
-	pipe->trapcorr_data.wv = 1.0f;
-	pipe->trapcorr_data.wh = 1.0f;
+	pipe->trapcorr_data.wv = 0.0f;
+	pipe->trapcorr_data.wh = 0.0f;
 	pipe->trapcorr_data.wv_new = pipe->trapcorr_data.wv;
 	pipe->trapcorr_data.wh_new = pipe->trapcorr_data.wh;
 }
@@ -877,16 +877,15 @@ void __stdcall color_pipe_stageconf_gamma(struct color_pipe_t *color_pipe, int e
 /**
  * Pipeline stage configuration: Isosceles Trapeze Correction
  * 
- * The vertical and horizontal correction weight are positive
- * numbers starting from 0. A weight of 1.0 means no correction. A weight lesser than
- * 1.0 means the upper trapeze line is shorter than the lower trapeze line.
- * Therfore a weight greater than 1.0 means the upper trapeze line is longer than
- * the lower line.
+ * The vertical and horizontal correction weight are per cent values ranging
+ * from -100.0 % to +100.0 %. A positive weight means that the upper horizontal trapeze
+ * is fixed and won't shrink while a negative value means the opposite lower line won't change.
+ * A weight of zero means not correction.
  * 
  * @param color_pipe Pointer to pipeline context
  * @param enable not 0: enable, 0: disable
- * @param wv vertical weight 
- * @param wh horizontal weight
+ * @param wv vertical weight (range: -100.0 to +100.0)
+ * @param wh horizontal weight (range: -100.0 to +100.0)
  */
 void __stdcall color_pipe_stageconf_trapcorr(struct color_pipe_t *color_pipe, int enable, float wv, float wh) {
 	// paranoia
@@ -896,11 +895,18 @@ void __stdcall color_pipe_stageconf_trapcorr(struct color_pipe_t *color_pipe, in
 	}
 	
 	// range check
-	if(wv < 0.0f) {
-		wv = 0.0f;
+	if(wv < -100.0f) {
+		wv = -100.0f;
 	}
-	if(wh < 0.0f) {
-		wh = 0.0f;
+	else if(wv > 100.0) {
+		wv = 100.0f;
+	}
+	
+	if(wh < -100.0f) {
+		wh = -100.0f;
+	}
+	else if(wh > 100.0) {
+		wh = 100.0f;
 	}
 	
 	color_pipe->trapcorr_data.enable = enable;